File:Air defense, Acetylene, First World War Fortepan 85698.jpg
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![File:Air defense, Acetylene, First World War Fortepan 85698.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a1/Air_defense%2C_Acetylene%2C_First_World_War_Fortepan_85698.jpg/386px-Air_defense%2C_Acetylene%2C_First_World_War_Fortepan_85698.jpg?20160901120325)
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Original file (4,191 × 6,513 pixels, file size: 13 MB, MIME type: image/jpeg)